Which dehydrators are good and efficient and what one don't work??? I've used an American Harvest with extra stacking trays for years. I have sometimes wished I had more control of airflow and temperature but the thing keeps on working so I haven't needed to buy a more expensive one. When the thing finally dies I will definately buy an Excalibur. As much as I use a dehydrator I can justify the expense. Tim in Kalispell